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Intake and Exhaust Valve Timing Control on a Heavy-Duty, Direct-Injection Natural Gas Engine
Technical Paper
2015-01-0864
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Natural gas high pressure direct injection (HPDI) engines represent a technology with the potential for lower engine-out emissions and reduced fuel costs over a diesel engine. This combustion process uses a direct injection of natural gas, into the combustion chamber of a high compression ratio engine, to maintain diesel engine performance. As natural gas will not auto-ignite at typical engine conditions, a small quantity of diesel pilot fuel is used to initiate the combustion event.
One potential technique to improve engine performance is the optimization of the intake and exhaust valve timings. To experimentally investigate these effects, tests were performed on a single cylinder engine based on Westport Innovation's 15L HD engine. The intake valve closing time was varied both before and after the standard closing (EIVC and LIVC). Early closing of the exhaust valve was also tested (EEVC). This work aimed to control in-cylinder residual content, equivalence ratio, and temperature to maximize performance and minimize emissions.
The results showed that, due to pressure pulsations in the intake manifold and valve flow restrictions, LIVC was marginally effective at reducing charge mass. EIVC provided a larger reduction in charge mass under equivalent conditions. At loads below 50%, up to a 70% reduction in CH4 emissions is measured at fixed intake pressures. At high load (75%) a 19% reduction in NOx is measured due to reduced in-cylinder temperatures resulting from lower effective compression ratios. At 10% load, EEVC cams can simultaneously reduce NOx, CH4 and CO along with generating higher exhaust temperatures.
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Patychuk, B., Wu, N., McTaggart-Cowan, G., Hill, P. et al., "Intake and Exhaust Valve Timing Control on a Heavy-Duty, Direct-Injection Natural Gas Engine," SAE Technical Paper 2015-01-0864, 2015, https://doi.org/10.4271/2015-01-0864.Also In
References
- Faghani , E. , Patychuk , B. , McTaggart-Cowan , G. , and Rogak , S. Soot Emission Reduction from Post Injection Strategies in a High Pressure Direct-Injection Natural Gas Engine SAE Technical Paper 2013-24-0114 2013 10.4271/2013-24-0114
- McTaggart-Cowan , G. P. , Mann K. , Huang J. , Wu N. , and Munshi S. R. Particulate Matter Reduction From a Pilot-Ignited, Direct Injection of Natural Gas Engine ASME 2012 Internal Combustion Engine Division Fall Technical Conference 427 437 American Society of Mechanical Engineers 2012
- Parvate-Patil , G. , Hong , H. , and Gordon , B. An Assessment of Intake and Exhaust Philosophies for Variable Valve Timing SAE Technical Paper 2003-32-0078 2003 10.4271/2003-32-0078
- Lewis , C , and Dembinski H Miller-cycle on a heavy duty diesel engine KTH Master of Science Thesis (Master of Science Thesis MMK2 2009:1 MFM124) 2009
- De Ojeda , W. Effect of Variable Valve Timing on Diesel Combustion Characteristics SAE Technical Paper 2010-01-1124 2010 10.4271/2010-01-1124
- Dunn , ME , McTaggart-Cowan GP and Saunders J High Efficiency and Low Emission Natural Gas Engines for Heavy Duty Vehicles IMechE Internal Combustion Engines Conference London, UK November 2013
- Tree , Dale R. , and Svensson Kenth I. Soot processes in compression ignition engines Progress in Energy and Combustion Science 33 3 2007 272 309
- Dec , J. A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging SAE Technical Paper 970873 1997 10.4271/970873
- McTaggart-Cowan , G. P. Pollutant formation in a gaseous-fuelled, direct injection engine PhD diss. University of British Columbia 2006
- The VTEC breakthrough: solving a century-old dilemma October 6 2014 http://world.honda.com/automobile-technology/VTEC/
- MIVEC October 6 2014 http://www.mitsubishi-motors.com/en/spirit/technology/library/mivec.html
- Kramer , U. and Phlips , P. Phasing Strategy for an Engine with Twin Variable Cam Timing SAE Technical Paper 2002-01-1101 2002 10.4271/2002-01-1101
- Fujita , T. , Onogawa , K. , Kiga , S. , Mae , Y. et al. Development of Innovative Variable Valve Event and Lift (VVEL) System SAE Technical Paper 2008-01-1349 2008 10.4271/2008-01-1349
- Fernandez , H. , Kazour , Y. , Knauf , M. , Sinnamon , J. et al. Development of Continuously Variable Valve Lift Mechanism for Improved Fuel Economy SAE Technical Paper 2012-01-0163 2012 10.4271/2012-01-0163
- Dittrich , P. , Peter , F. , Huber , G. , and Kuehn , M. Thermodynamic Potentials of a Fully Variable Valve Actuation System for Passenger-Car Diesel Engines SAE Technical Paper 2010-01-1199 2010 10.4271/2010-01-1199
- Wickström , Anders Variable Valve Actuation Strategies for Exhaust Thermal Management on a HD Diesel Engine KTH Master of Science Thesis 2012
- Jones , Heather L. Source and characterization of particulate matter from a pilot-ignited natural gas fuelled engine MASc. diss. University of British Columbia 2004
- Patychuk , B. Particulate matter emission characterization from a natural-gas high-pressure direct-injection engine MASc. diss. University of British Columbia 2013
- VVA Applications October 6 2014 http://dieselnet.com/tech/air_vva_app.php